Focal-plane shutter.



UKTENTED JUNE 23, 1908.

No. 891,770. n

s. B. Mmmm 'EQGAL PLANE SHUTTEP.. APPLICATION FXLED SEPT.3,1907.

N mit@ FTW? tiene in n. filtern:

JULUS B. GARFELD, F SPRNGFIE'JD, MASSACHUSETTS, 1

@SGAR-PLANE SHUT? no. seiymo Specification oi' Letters Feten@Application filed September 3, 19o?. No. Z'.

Q class whereby the shutter may be quickiy set by ineens outside of thecanieradioi: for either an instantaneous or a tiine exposure, andwhereby, hy the sanie'nieans, the e1;- tent ot the opening ci theexposing slit in the shutter may be quickly established; a iurtherobject being to provide means located in proximity to the shuttersetting devices, whereby the extent o' the o ening of said shutter maybe indicated: and the invention. 1

also consists in the construction of a shutter oi this class which coinprisestwo su perposed curtains `movable as one in one direction; and invarious novei constructions and arrangements of parts all as fullydescribed in the following specication, and cleariy set forth 'in theclaires in the drawings forming part o." this speci filiation-Figure lis perspective view oi the rear portion or, reversible back et a camerahaving niy improved shutter applied thereto. Figs. 2, 3 l are verticalsections et the shutter as taken on the iine :l-X, Fig. i, ditlerontrelations of the eurtains comprised as importent parts of the shutterbeingl shown, for rendering the opera tive capabilities of the yshutterentirely' clear. 51s a perspective view oi' the curtains and theirsupporting rollers shown as removed from the supporting structurethereiorz-Fig. 6 being a perroective view et the supporting structure;anni Fig. 7 is a perspective view of movable appliances with. which thecurtains are connected or engaged.

Similar characters ci rete-rence indicate corresponding parts in all othe views. v

ln the drawings, i() indicates the rea' pon tion of a camera-box, and,as indicated in Fig. 1, it inav be a detachable part or section or' themain camera-body. @ne side et this box section is provided with anopening i2 tor the admission ot a 'plate or iilinpacl hoider. Locateddirectly4 opposite this opent the earners ing on the inside oft saidpart "i0 box is a rectaugu i preterabiy of sheet inetai. i he front o;th s cese is provided with a rectangular openin of about the size andshape oi the plat t .et the rear ot this ensuing the' e springs l5, oi'coinni on construction, to pressing the platediolder to the properposition against the iront of the case and adjacent the opening le.

At each upper and lower corner, at both ends oi. the case, are bent-upears 16 which have holes tor screws or rivets by which the case is fir'ily attached to the camera bei;`

'rubber coated cloth or similar or otherwise suitable lightexoiuding andflexible fabric or materiel. Both of these curtains have openingsrepresented by the numerals 24C and 25 respectiveiy. Secured to thesprin@k relier Y' i Wound thereon., is a third curtaindike 'tiene bieconnection 2S, the opposite end ot which is attached to the rib orbatten 2G on the curtain 22, iliustrated in the Figs. 2 to 5 di thedrawings. Another rib, plateor batten 27 made of sheet nietai isprovided, the saine having two inwardiy bent or lugs 22) which projectthrough the curtain 23, and are adapted to engage the ton of the rib orhatten 253 on the curtain Centraily located on said rib 27 is anoutwardly projecting knob 3() which, as shown in Figs. 1 to 4, isadapted to slide verticaiiy in the siot 3l in the seid rear section orback 10 ci the carriera-box. in Fig. 4: the relative positions of theabove described curtains, openings, and ribs are shown as in readinessto make a speed or so-called instantaneous eX- nosure,--the curtainsbeing shown in full. lines and the openings 24 and 25 in dot and inseparated. relations for the purposes of clear-ness. On the 1oottonnside of the case 13 is shown a pivoted catch or detent 32 (Figs.

J and adapted, by its one end to beV device 34 of any suitableconstruction to vary the speed of travel of the shutter, such.

affording a means .for putting la suitable tension on thecurtain-roll-spring 9, which spring, and its tensioning means ustreferred to are the same as those very common in household curtain orshade rollers. These two endless curtains, 22 and 23, aranged one overthe other and adapted to be supported on the'above described-rolls 17and 19, and

l with the'openings 24 and 25 and the means for moving the curtains andtheir-'openings relative to each other, constitute the shutter pro )er'and the subject of this invention.. 1n suc operation the battens 27 and26 of the outer and inner ciutains 23 and 22 move upwardl at the rear ofthe device, and when the kno 30 on the batten 27 reaches the u per endwall of the slot 31 the movement oi) the outer curtain with its bettenwill be arrested; but the winding up action of the spring roller willstill be effective to further move the inner curtain,-and thenindependentl of the outer curtain,-until the batteri 26 thereofisbrought to contact against the lugs 29 appurtenant to the outer curtain,whereupon the relative positions of the curtains will be such, as shownin'Fig. l, that the slit or exposure opening will-be closed.

The operation, as ap arent from Figs. 2, 3 and 4is as follows :-Pl`henormal position of the knob 8U, after an exposure has been made, isindicated in Fig. 2. A downward movement now of the knob, 30, brings thel rib 27 on the curtain 23 into engagement With the rib26 on the curtain22, and thus carries the rear portion or' the two curtains downwardly asone; and, at the same time, by means of the curtain-like connectionv28,-the spring-roller 17 is positively rotated againstthe -action of itsspring.' On reachin the limit ofk downward movement provied for, thedetent 32 engages the top of the rib 26,' andthus, as s een in Figs. 3and 4, l

holds the curtain 22 in itsset position.

An upward or return. movement of the knob 30 now causes the curtain 28te'slide over the curtain -22, the latter remaining stationary, andthereby changing the relative positions of the openings 24 and 25, a

slit or opening is formed identical in vertical extent with the distanceof the said return movement of the linob,-an illustration o' which willbe perceived en reference to ig.

seins-fo 4. The degree oi opening may be adcuA vrately measured anddiscerned by the scale, l

curtains to travel as one around the two rollers 17 and 19, and in sodoing causes the exposing slit to move more or .less ra )idly downwardand across the sensitive photoi graphic plate and thus to make theexposure.

1. In a focal lane shutter for cameras, the combination ol two endlessand superposed curtains, ada ted to receive and encircle, between theront and rearcourses thereof, a photographic plate and having openingstherein, the opening in one curtain being normally covered by a part ofthe other curtain, supports for lthe curtains, and means for moving oneof the latter in one direction relative to. the other to bring more orless of the area of one of said explosure openings opposite the other toform lan exposure slit, and meansior moving both ci said curtainssimultaneously in a direction to eilect the passage of the exposure slitacross said plate.

2. In a 'focal plane shutter for cameras, the l combinationn of twosuperposed curtains adapted to encircle a' photographic plate andvhaving openings therein, the opening in lone curtain .being normallycovered by a part of the other curtain, su porting rolls for thecurtains, one of said ro ls being power-actuated in one direction, adetent for one of the curtains, and means for moving the other inoncdirection to bring some part of ,one of said Vopenings opposite theother opening to form an exposure slit, and means for operating saiddetent whereby said power-actuated roll may move both of the curtainssimultaneously to effect the passage of said exposing slit across saidplate.

3. 1n a focal plane shutter for cameras, the combination of two endlessand superposed curtains, adapted to receive and encircle, be-

tween the iront and rear courses thereof, a

photographic# plate and having openings therein, rolls l'or Supportingthe curtains, lsaidv curtains having exposure openings therein, onenormally out oi registration with the other, a detent for holding one ofsaid curtains temporarily stationary, and 'means for `moving the otherof said curtains independently in one direction to bring said openingsmore or less nearly into registering position to form an exposure' slit,means for applying endwise tension to said curtains, and means formoving both of said curtains si iuultaneouslyin a direction the reverseof that in which the one olx4 said curtains shall have been moved, forcav ming a.

anim fm" in tmwng i LM 1 exposure, slit, :ms-05s the fasc m; 4, Thecombination, m a 12a neifcr Camaras, a ci@ ma' l m1 engagement with ih@zo 'propelled 'threb und "vm other folle? Second cur*- ss,.supe3p0sedabout the ining a fxconal surface G011- alajgirm to encircle a plus itsfront and rem courses, mlans hmffv? 'fm @Xpoisura mf; fm justing @he 1maha @tha to bril g MiO/ns in Cas'ed Latons, m'va te) hold me.'frictionains against their olel ents, andi() *ahem iis in unis-fm.

